Compare your rese products and reac- enthalpy of formation values of the tants listed in Appendix 2. 1 Additional Problems 3.61 A 2.10-mole sample of crystalline acetic acid, ini tially at 17.0°C, is allowed to melt at 17.0°C and is the heated to 118.1°C (its normal boiling point) at 1.00 atm. The sample is allowed to vapórize at 118.1 C and is then rapidly quenched to 17.0°C, so that it recrystal- lizes. Calculate the value of ArHo for the total process as described. 3.62 Predict whether the values of q,W,AU, and ΔΗ are positive, zero, or negative for each of the following processes: (a) melting of ice at 1 atm and 273 K, (b) melting of solid cyclohexane at 1 atm and the nor- mal melting point, (c) reversible isothermal expansion of an ideal gas, and (d) reversible adiabatic expansion of an ideal gas. 3.63 Einstein's special relativity equation is E mc2 where E is energy, m is mass, and c is the velocity of light. Does this equation invalidate the law of conser
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.